Store multiple objects with same name in localstorage using store.js

I am trying to store cart data in localstorage, I am starting out so I want to store all the products in localstorage using store.js

I want to store the name, price and quantity of each added item to the cart.

Here's what I am doing so far:

$('.proAdd').click(function(){
var name = $(this).attr("data-name");
var price = parseFloat($(this).attr("data-price"));
var quantity = parseInt($(this).attr("data-quantity"));                    
store.set('item', { name:name, price:price, quantity:quantity })
});

So this is ok if I just have one item in the cart, when I add another product it overwrites the item object. How can I turn this into an array of objects so that when I add another it could look like this:

{"name":"T-Shirt","price":3.99,"quantity":1}, {"name":"Blue Jeans","price":13.99,"quantity":1}

Any help would be appreciated. Cheers.